Discontinued Operations and Assets and Liabilities Held for Sale - Amounts Included in Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (2,534)	$ (27,030)
I4c Innovations | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	0	70
Marketing expenses	(18)	(1,552)
Cost of revenue	(4)	(1,421)
General and administrative expenses	(1,718)	(15,604)
Impairment	(180)	(7,043)
Depreciation and amortization	(1)	(1,538)
Interest expense	0	(3)
Other income	0	4
Loss from discontinued operations before income taxes	(1,921)	(27,087)
Loss on disposal of discontinued operations	(613)	0
Income tax benefit	0	57
Loss from discontinued operations, net of tax	$ (2,534)	$ (27,030)